Foren / Cotonti / Development / Question about root php

Can anybody tell me where $m stands for ?

It always goes to the default anyway..

switch($m)
	{
	default:
	require_once(......inc.php');
	break;
	}

Found it, it comes from the GET

$m = sed_import('m','G','ALP',24);
$n = sed_import('n','G','ALP',24);
$a = sed_import('a','G','ALP',24);
$b = sed_import('b','G','ALP',24);

BUT what meaning does m,n,a,b has... (What is usually done with these vars) ??